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Description of the Business and Summary of Significant Accounting Policies - Reduction in Workforce (Narrative) (Details) - 2024 Global Workforce Reduction Plan - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 31, 2024	Mar. 31, 2025	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Expected reduction of workforce	20.00%
Expected costs	$ 65.0
Payments for restructuring, including pro rata amount		$ 10.2	$ 62.2
Charges		$ 2.3	$ 49.5
Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected costs	$ 51.0

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